Made a couple of mistakes.

I have a 2001 Civic, D17A1. I'm rebuilding the engine. I decided to put a new oil pressure switch in. Well, I was ignorant and torqued the thing down too much and it snapped off. Then I tried using one of those broken bolt removers, but I used a smaller remover than the original drill bit called for, and when I tried to take it out, it snapped, and now I'm not sure what to do, because I can't drill through the bit that is snapped off inside there.

Will my engine run ok if I don't have an oil pressure switch?